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Description
casse tete mathematique addition des anneaux pour atteindre 50The wooden math puzzle 5 rotating rings, diameter 12. 8 cm, natural wood. Objective: align the numbers in each column to obtain a sum of 50. Over 65,000 possible combinations, only one is correct. An educational tool and intellectual challenge for ages 8 and up. Objective: sum 50 per column Each column of numbers must total exactly 50 seemingly simple, but with 65,000 possible combinations and only one correct solution. 5 independent rotating rings
The wooden math puzzle — 5 rotating rings, diameter 12.8 cm, natural wood. Objective: align the numbers in each column to obtain a sum of 50. Over 65,000 possible combinations, only one is correct. An educational tool and intellectual challenge — for ages 8 and up.
Objective: sum 50 per column
Each column of numbers must total exactly 50 — seemingly simple, but with 65,000 possible combinations and only one correct solution.
5 independent rotating rings
Each ring rotates independently and exposes or hides the numbers on the lower ring — each rotation changes the set of visible values in each column.
65,000 combinations — 1 solution
The complexity is exponential — each ring movement interacts with the others. The unique solution requires logic, patience, and method.
Natural wood — D12.8 cm
Made of quality natural wood, pleasant to the touch. Diameter 12.8 cm — compact and can be placed on a desk or shelf.
Stimulates logic and concentration
Develops logical thinking, problem-solving, patience, and numerical skills — an educational tool disguised as a game.
Educational gift for all ages
For children aged 8 and up, adults, math enthusiasts, and puzzle lovers — a challenge that never gets old.
Wooden math puzzle — 5 rings · D12.8 cm · sum 50 · 65,000 combinations
On the surface, it's simple: turn the rings so that each column displays a sum of 50. In practice, each rotation of a ring simultaneously modifies several columns — and with 65,000 possible combinations for a single correct solution, brute force logic is not enough. It requires a method, patience, and the satisfaction of having overcome one of 65,000 dead ends before finding the right one. Made of natural wood, 12.8 cm in diameter — the puzzle that stays on the desk until you've solved it.
| Material | Natural wood |
| Diameter | 12.8 cm |
| Rings | 5 — rotating and independent |
| Objective | Sum of 50 in each column |
| Combinations | Over 65,000 — 1 single solution |
| Recommended age | 8 years and up |
| Packaging | Shrink wrap |
Tip for solving: start by fixing a reference ring (the central one, for example) and analyze the columns one by one. Note the visible values before each rotation to understand the impact of each movement. A systematic column-by-column approach is more effective than random trial-and-error — even if trial-and-error is part of the fun.
High difficulty level: with over 65,000 possible combinations and only one correct solution, this puzzle is designed to be challenging. Don't get discouraged — solving it may take several sessions. This is precisely what makes it a memorable and satisfying challenge.
🎁 The gift for logical minds: natural wood, D12.8 cm, 5 rings, 65,000 combinations. A unique intellectual challenge for a birthday, Christmas, teacher gift or math lover's gift — for children aged 8 and up and adults who love puzzles.
Frequently Asked Questions
How does the puzzle work?
The puzzle consists of 5 independent stacked rotating rings. Each ring rotates freely and exposes or hides the numbers on the lower ring. The goal is to align the rings so that the sum of the numbers in each column is exactly 50. With over 65,000 possible combinations, only one configuration is correct.
Is it really difficult to solve?
Yes — it's a serious challenge. The difficulty comes from the fact that each rotation of a ring simultaneously modifies several columns, creating complex dependencies between values. With 65,000 possible combinations for a single solution, a methodical approach is necessary. Solving it can take several hours or several sessions.
What is the recommended age to play?
From 8 years old — but the complexity of the challenge is especially suitable for adults and children who are comfortable with mathematics. For younger children, free exploration of the rotating rings remains a fun and stimulating activity even without the goal of formal resolution.
Is there a unique or multiple solution?
There is only one correct configuration among the 65,000 possible combinations — the one where all columns simultaneously display a sum of 50. It is this unique character of the solution that makes solving it so satisfying.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.4 ★★★★★
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Product Reviews
★★★★★ 5
Fits perfect and works as designed. Flows like OEM and looks well made.
Style: BE-553B 1-Pack
This filter is very comparable to the stock filter. Fits the BMW G20 just like OEM. I would not say it is two times "heavier" as advertised on the box, but it is very comparable to stock. It's the same weight and similar construction. BMW has a very robust cabin filter. This will be my go to. I did purchase another aftermarket cabin filter that fit well, but was thin, flimsy and had a bad chemical odor. This one is fine and airflow is the same as OEM. I change them every year or so. I don't worry too much about longevity with cabin filters personally.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
★★★★★ 4
Good quality but it was slightly longer than original and needed modification.
Style: BE-182 1-Pack
Bought this cabin filter for a 2023 Acura TLX. While the filter seems to be made of quality material, it was just a little too long (about a 1/16 of an inch, so I had to trim it to make it fit so the cover would fit snug. I was able to do that without compromising the filter itself. But this might be an issue for some people
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 5
Fits my Chevy 2021 Bolt Premier perfectly.
Style: BE-966 1-Pack
Installation was a breeze, fir nicely and the air in teh car now smells fresh and clean. The old filter has developed a musty smell so this new one is great. Had it replaced in under 3 minutes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 5
Fits perfectly for my 2017 VW Passat
Style: BE-373 1-Pack, Style: BE-373 1-Pack
Bought this for a fraction of the cost. An auto shop wanted to charge me $72.99 for a filter so I bought this Spearhead brand cabin filter and its the perfect size and its just as sturdy as the previous one the dealership had in the car. Not sure yet how the airflow is or if anything different as I have not driven in the car since it was replaced, but it appears to be a very high quality cabin filter for my car at a great price.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Good Quality Replacement for Lexus
Style: BE-285 1-Pack
Was a perfect fit for my 2016 Lexus NX200t. No tools required. Total of 5 minutes to install. Airflow is good after replacement and the activated charcoal seems to make a difference in reducing any smells from outside. Recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026
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